chore(github): adopt grouped issue labels

Issue labels move to type/platform/area/status groups. Templates apply
the renamed type labels, the bug form gains HarmonyOS (reports such as
#308 had to pick Android), and questions are pointed at Discussions Q&A.

A workflow labels the platforms an issue mentions when it is opened.
Scanning title and body covers both form and free-form reports; on
existing issues it matched the form's platform in 46 of 55 and caught
reporters who picked the wrong dropdown entry.

Dependabot gets a fixed `dependencies` label so it no longer recreates
the ecosystem label `rust`.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,7 +1,7 @@
 name: 问题报告 / Bug report
 description: 报告可复现的 TauriTavern 故障 / Report a reproducible TauriTavern problem
 title: "[Bug] "
-labels: ["bug"]
+labels: ["type: bug"]
 body:
   - type: markdown
     attributes:
@@ -28,6 +28,7 @@ body:
         - Linux
         - Android
         - iOS
+        - HarmonyOS
     validations:
       required: true
 

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,4 @@
+contact_links:
+  - name: 提问与求助 / Questions and help
+    url: https://github.com/Darkatse/TauriTavern/discussions/categories/q-a
+    about: 使用问题请在 Discussions 提问。 / Ask usage questions in Discussions.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,7 +1,7 @@
 name: 功能建议 / Feature request
 description: 提议一项有明确使用场景的改进 / Propose an improvement grounded in a concrete use case
 title: "[Feature] "
-labels: ["enhancement"]
+labels: ["type: feature"]
 body:
   - type: markdown
     attributes:

.github/dependabot.yml

@@ -20,3 +20,4 @@ updates:
       - dependency-name: "dispatch2"
     commit-message:
       prefix: "chore(deps)"
+    labels: ["dependencies"]

.github/workflows/issue-platform-labels.yml

@@ -0,0 +1,35 @@
+name: Issue platform labels
+
+on:
+  issues:
+    # Labels removed during triage must stay removed, so edits are not rescanned.
+    types: [opened]
+
+permissions:
+  issues: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label platforms mentioned in the issue
+        uses: actions/github-script@v9
+        with:
+          script: |
+            const platforms = {
+              Windows: /\bwin(dows|10|11)?\b/i,
+              macOS: /\bmac(os|book)?\b/i,
+              Linux: /\b(linux|ubuntu|debian|fedora|flatpak)\b/i,
+              Android: /\bandroid\b|安卓/i,
+              iOS: /\b(ios|ipados|iphone|ipad)\b/i,
+              HarmonyOS: /\b(harmonyos|openharmony)\b|鸿蒙/i,
+            };
+            const { number, title, body } = context.payload.issue;
+            const text = `${title}\n${body ?? ''}`;
+            const labels = Object.keys(platforms)
+              .filter(name => platforms[name].test(text))
+              .map(name => `platform: ${name}`);
+
+            if (labels.length > 0) {
+              await github.rest.issues.addLabels({ ...context.repo, issue_number: number, labels });
+            }